fix: Pass bias-T setting to ADS-B and AIS dashboards

The bias-T checkbox on the main dashboard was not being passed to the
ADS-B and AIS tracking start requests. Added getBiasTEnabled() helper
to each dashboard that reads from shared localStorage, and updated all
start request bodies to include bias_t parameter.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

templates/partials/modes/ais.html

@@ -45,7 +45,7 @@
         fetch('/ais/start', {
             method: 'POST',
             headers: { 'Content-Type': 'application/json' },
-            body: JSON.stringify({ device, gain })
+            body: JSON.stringify({ device, gain, bias_t: typeof getBiasTEnabled === 'function' ? getBiasTEnabled() : false })
         })
         .then(r => r.json())
         .then(data => {